Touch control display screen with a built-in electromagnet induction layer of septum array grids

ABSTRACT

A touch control display screen with built-in membrane antenna array lattice electromagnetic induction layer, including at least a display screen and a shell; wherein an induction layer is provided in the rear of the display screen, the output of the induction layer is connected to an induction control circuit, a display screen control circuit is also provided in the shell; the induction layer is the antenna array printed on the insulation membrane and arranged along the X, Y axes, therein the area enclosed by each lattice unit constitutes one induction cell. Because the electromagnetic induction layer is provided in the rear of the display screen and flexible membrane-type, printed electromagnetic induction array antenna is used as the identifying induction component according to the present invention, the manufacture is easy, the cost is low, and the advantage in cost-cut is prominent in comparison with the prior art when the area of the display screen is larger. The accuracy of identification is high, and the mouse information or handwriting information can be input exactly by means of brush strokes of finger strokes; as a touch screen, the display screen is covered by a protecting film to avoid the physical damage, so it has long operating life.

TECHNIQUE FIELD

The present invention relates to a touch screen, particularly to a touchcontrol display screen with built-in membrane antenna array latticeelectromagnetic induction layer, and the present invention belongs tothe field of the electronic technology.

BACKGROUND ART

More and more ways to transform information to electronic form anddigital form come forth along with wide application of the computertechnology. Various peripheral of computer are used, and various methodfor digitalization in beginning of information processing procedure. Forexample, there are various methods for keyboard input, voice input,image pickup and so on, wherein the most effective and convenient one isthat the information input and command calling are performed by means oftouching or clicking etc. directly on a display screen. As painting anddrawing by using a computer, the mouse operation is not agile as same ashand-writing and hand-drawing on paper by using a pen, so it is hard tocomplete expertly a delicate and beautiful pattern or picture. However,by using a touch screen, the direct operation on the display screen by atouch control pen is just as same as drawing on a paper, therefore thewhole work procedure is very easy to be completed with good effect.Furthermore, various peripherals, such as keyboard and mouse, are allomitted along with the continuous development of the portable product.For example, there is substantially no operation of keystroke in use ofthe PDA (personal digital assistant), but various operations are allcompleted by using a touch control pen and a touch screen.

Traditional touch-control panels are mainly those withresistance-induction method. With regard to the concrete configuration,a transparent touch film is provided outside the display screen, and iscoated with a resistance layer on its surface. When a specific positionon the touch film is clicked in the operating procedure, then theidentification control circuit determines the position coordinates ofthe click by calculating the potential shift in this position, therebyperforms respective operation. However, the existing touch screen is notapplied widely, because of the following disadvantages: high cost,complex process, low accuracy in the case of large-sized touch-controlpanel; inconformity for handwriting input; and physical damage such asabrasion by a plurality of operations, which will reduce the operatinglife of the touch film.

SUMMARY OF THE INVENTION

The object of the present invention is to overcome the disadvantages ofthe prior art, to provide an touch control display screen with built-inmembrane antenna array lattice electromagnetic induction layer, whichhas the advantages of lower cost, simple manufacture procedure, highaccuracy of identification-collection and long operating life.

The object of the present invention is achieved by the followingtechnical solution:

A touch control display screen with built-in membrane antenna arraylattice electromagnetic induction layer, including at least a displayscreen and a shell; wherein an induction layer is provided in the rearof the display screen, the output of the induction layer is connected toan induction control circuit, a display screen control circuit is alsoprovided in the shell; the said induction layer may be the antenna arrayprovided on the insulation membrane and arranged along the X, Y axes,therein the area enclosed by each lattice unit constitutes oneelectromagnetic induction cell.

A shield layer is provided after the induction layer for enhancing theanti-interference ability of the device; a buffering layer is providedbetween induction layer and shield layer.

A space is provided between the shield layer and the display screencontrol circuit.

The induction layer may be the antenna array formed by the silver-plasmor the mixture material of the silver-plasm and the carbon-plasm whichis printed on the insulation membrane. The induction layer can beprinted on two surfaces of the insulation membrane, or printed on onesurface of the insulation membrane, and there are two layers ofinsulation membrane in which one is overlaid on the other.

The insulation membrane may be film material in order to cut the cost.

In order to improve the accuracy of induction of the induction layer,two or more induction layers are overlaid together and the inductioncells on respective induction layers are set to interlace with eachother. The interval sizes of the induction cells on respective layersmay be same or different.

The components of the induction control circuit are mounted on a printedsubstrate which is separated from the induction layer, the output of theantenna array of the induction layer is connected to the correspondinginput terminal on the printed substrate by means of pressure-connection,plug-in connection or welding-connection. The output of the antennaarray of the induction layer is positioned between a hard sheet and aprinted substrate. A buffering layer is provided between the hard sheetand the output of the antenna array; the hard sheet, buffering layer andthe output of the antenna array are overlaid on the printed substrate bymeans of the screwing-conjunction; the output of the antenna array isconnected with corresponding input terminal on the printed substrate.

The printed substrate may be the printed substrate of the display screencontrol circuit in the body of the display screen, or may be the printedsubstrate may be the printed substrate of the display screen controlcircuit outside the body of the display screen, or a self containedunit, otherwise it may be set on the main board of PC. The connectionbetween them is achieved by line or cable.

The induction control circuit is positioned outside the body, andconnected to the body through the electrical connection means. Theoutput of the antenna array of the induction layer is connected with theoutput interface of the induction layer by means of pressure connection,plug-in connection, or welding-connection. On the control circuit, aninterface which can match the electrical connection means of theinduction layer is provided.

The output interface of the induction layer and the interface of thecontrol circuit may be one of the following: pin-type connection means,flexible printed circuitry means, PIN-PIN connection means, welding spot(VGA) thermal-melted connection means, ultrasonic welding device,solder-plate welding device, puncture-type connection means.

A protecting layer is provided in front of the display screen. Thedisplay screen is a plasma display screen or a liquid crystal panel.

After studying of the above-mentioned technical solutions, it is knownthat the present invention possesses the following advantages:

Because the electromagnetic induction layer is provided in the rear ofthe display screen and flexible membrane-type, printed electromagneticinduction array antenna is used as the identifying induction component,the manufacture is easy, the cost is low, and the advantage in cost-cutis prominent in comparison with the prior art when the area of thedisplay screen is larger.

Because the electromagnetic induction array antenna is used as thecomponent of induction, the accuracy of identification is high, and themouse information or handwriting information can be input exactly bymeans of brush strokes of finger strokes.

Because the electromagnetic induction layer positioned in the rear ofthe display screen generates the signal, and the display screen as thetouch screen is covered by a protecting film to avoid the physicaldamage, so it has long operating life.

DESCRIPTION OF FIGURES

FIG. 1 is a diagram showing the structure of an embodiment according tothe present invention;

FIG. 2 is a diagram showing the structure of another embodimentaccording to the present invention;

FIG. 3 is a diagram showing the structure of the antenna array of theinduction layer in the present invention, which is etched or printedalong X-axis;

FIG. 4 is a diagram showing the structure of the antenna array of theinduction layer in the present invention, which is etched or printedalong Y-axis;

FIG. 5 is a diagram showing massive structure of the induction cellsformed by the X-Y directional antenna array of the induction layer inthe present invention;

FIG. 6 is a diagram showing the structure of two induction layersoverlaid one by one according to the present invention;

FIG. 7 is a diagram showing the principle of the generation of theinduction signal and identification of the input touch location;

FIG. 8 is a diagram showing the connection between the induction layerand the control circuit which are separated according to the presentinvention;

FIG. 9 is a diagram showing the connection between the output of theantenna array and the corresponding input terminal of the printedsubstrate (or electrical connection means) according to the presentinvention;

FIG. 10 is a diagram showing the identification circuit according to thepresent invention.

MODE OF CARRYING OUT THE INVENTION

The present invention will be explained in detail with reference to thedrawings.

As shown in FIG. 1, a touch control display screen with built-inmembrane antenna array lattice electromagnetic induction layer accordingto the present invention includes at least display screen 3 and shell 1,7; wherein an induction layer 4 is provided in the rear of the displayscreen 3, the output of the induction layer 4 is connected to aninduction-collection control circuit, a display screen control circuitis also provided in the shell 1, 7. The display screen 3 is a plasmadisplay screen, a liquid-crystal display screen or other flat displayscreen.

According to the present invention, the induction layer 4 is providedafter the display screen 3, and the induction layer 4 can also inducethe touch position of the handwriting through the display screen. Withrespect to the concrete configuration, the area of the induction layer 4is same as the area of the display screen 3. A shield layer 5 isprovided after the induction layer 4, and a display screen controlcircuit 6 is provided after the shield layer 5. The shield layer 5 isinsulated and shielded with induction layer 4 and display screen controlcircuit 6 respectively. Certainly, the shield layer 5 and the displayscreen control circuit 6 may be provided in other space of the displayscreen or main unit. However, the conjunction of the shield layer 5 withthe display screen control circuit 6 and induction layer 4 by means ofoverlaying each other is advantageous to concentrate the whole inductiondevice. A space is provided between the shield layer 5 and displayscreen control circuit 6, in order to further ensure the shield effect.Certainly, in the case that the space is kept between the shield layer 5and the induction layer 6, there is already the insulation effect,whereby the shield layer 5 can has no insulating layer material thereon.The shield layer 5 is used to enhance the anti-interference ability ofthe device.

Furthermore, a transparent protecting layer or a protecting film 2 isprovided in the front of the display screen 3, in order to improveanti-wear performance of the surface of the display screen 3 and so on.

Further, a buffering layer 8′ is provided between the induction layer 4and the shield layer 5, or a buffering layer 8′ is provided between theinduction layer 4 and the shield layer 5. The buffering layer is used tokeep a reasonable space between the induction layer 4 and the shieldlayer 5. Furthermore, the electromagnetic signal is transmitted from thepen in the both cases that the pen is pressed down and the pen is notpressed down, so as to control conveniently. Certainly, in amodification of the invention, the electromagnetic signal is nottransmitted in the case that the pen is not pressed down. Furthermore,the pen can be provided with pressure induction means in order tosensing the pressure by using different frequency.

As shown in FIG. 2, according to different requirement, for example, inthe case that a part of the display screen 3 is used as the touch inputregion or touch operation region, the area of the induction layer 4 maybe smaller than the area of the display screen 3, and the inductionlayer 4 may be positioned in one or two or four sides of the displayscreen 3. Certainly, the area of the induction layer 4 may be largerthan the area of the display screen 3, so the whole display screen 3 andthe periphery of the display screen 3 possess the capability oftouch-operation.

As shown in FIGS. 3, 4 and 5, the induction layer 4 may be the antennaarray 52, 51 printed on the insulation membrane 55 and arranged alongthe X, Y axes, therein the area enclosed by each lattice unitconstitutes one induction cell 53. The insulation membrane 55 may befilm material in order to cut the cost. The induction layer 5 may be theantenna array formed by etching the copper-platinum covering theinsulation membrane 55, may be the antenna array formed by flexibleprinted circuitry (FPC), and may be the antenna array formed by thesilver-plasm or the mixture material of the silver-plasm and thecarbon-plasm which is printed on the insulation membrane.

The induction layer can be printed on two surfaces of the insulationmembrane, or printed on one surface of the insulation membrane, andthere are two layers of insulation membrane in which one is overlaid onthe other.

As shown in FIG. 6, two or more induction layers 4 and 4′ are overlaidtogether and the induction cells 53 on each induction layer are set tointerlace each other, so as to improve the accuracy of the touch screen.The interval sizes of the said induction cells on respective layers maybe same or different. After the induction layers that each layer hasdifferent interval size of the induction cells 53 are overlaid together,the scale unit of the coordinates is consequentially shorten, so theaccuracy of induction is improved. In the case that the induction layershaving same size of the induction cells 53 are overlaid together,because the induction cells 53 on different induction layers are set tointerlace each other, the scale unit of the coordinates can also beshorten, and so the sensitivity of the electronic white board isimproved.

The induction-collection control circuit of the induction layer 4 andthe output of the antenna array of the induction layer are integrated bydirect connection, the components of the induction-collection controlcircuit are positioned on the output terminal of the antenna array, andthe induction-collection control circuit is positioned in the shell. Forexample, when flexible printed circuitry (FPC) antenna array is used,both are integrated together, the antenna array and theinduction-collection printed circuit are formed by etching at one time.

The components of the control circuit are mounted on a printed substratewhich is separated from the induction layer, the output of the antennaarray of the induction layer is connected to the corresponding inputterminal on the printed substrate by means of pressure-connection,plug-in connection or welding-connection.

The specific connection mode is as shown in FIG. 9, therein the outputof the antenna array of the induction layer is positioned between hardsheet 600 and printed substrate 500. The buffering layer 7 is providedbetween the hard sheet 600 and the output of the antenna array. The hardsheet 600, buffering layer 7 and the output of the antenna array areoverlaid on the printed substrate 500 by means of thescrewing-conjunction of the screw 700. The output of the antenna arrayis connected with the corresponding input terminal 511′ of the printedsubstrate 500.

The printed substrate may be the printed substrate of the display screencontrol circuit in the body of the display screen. Therefore, thecontrol components can be concentrated, the number of module can bereduced, and the cost can be cut.

The printed substrate may be the printed substrate of the display screencontrol circuit outside the body of the display screen, or a selfcontained unit, otherwise it may be set on the main board of PC. Theconnection between them is achieved by line or cable.

The induction control circuit is positioned outside the body, andconnected to the body through the electrical connection means. Theoutput of the antenna array of the induction layer is connected with theoutput interface of the induction layer by means of pressure connection,plug-in connection, or welding-connection. On the control circuit, aninterface which can match the electrical connection means of theinduction layer is provided. The specific connection mode is shown inFIG. 8. The components of the induction-collection control circuit canbe also provided on the printed substrate 8 which is separated from theinduction layer 4 but integrated with the display screen controlcircuit. Certainly, they can be provided outside the body of the displayscreen, for example, they can be set in a PC. The output 82 of theantenna array of the induction layer is connected with the correspondinginput terminal 81 of the printed substrate by means of pressureconnection, plug-in connection or welding-connection. The connectioninterface may be the existing universal standard interface, for example,the output interface 82 of the induction layer and the interface 81 ofthe control circuit may be one of the following: pin-type connectionmeans, flexible printed circuitry means, PIN-PIN connection means,welding spot (VGA) thermal-melted connection means, ultrasonic weldingdevice, solder-plate welding device, puncture-type connection means.

The touch-control mechanism of the present invention is as shown in FIG.7. In FIG. 7, P is the signal input terminal of the pen, and there is abigger conductor p′ on the head of the pen. The electromagnetic pentransmits electromagnetic signal continuously. When pen-point touchesthe induction generation device, said electromagnetic signal passesthrough the induction antenna at the corresponding location, then theantenna at this location induces a signal. The location signal inducedby the induction generation device is transferred to the input terminalof the control identification circuit through the wire lead on X, Ydirection. After array strobe, control process, bandpass filter,detection-rectification and A/D conversion, the resultant locationsignal is transferred to the processing circuit and calculated by theCPU, so as to determine the location coordinates of the electromagneticsignal on the induction antenna and various operation statuses. Abovedata or information is sent to a computer, whereby to control thecomputer to identify, display, record and so on.

Furthermore, in order to obtain the pressure of pen-point as writing andto improve the induction accuracy of the location signal, a Z-axisdirected pressure sensor is provided in the tail of the pen-point, andthe output of the sensor is connect to the control terminal of theelectromagnetic wave generation device. So the transmittedelectromagnetic wave signal can be changed by the pressure-touching,thereby the pressure (input signal) of the pen-point can be identifiedmore reliably.

As shown in FIG. 10, the electromagnetic operating-pen is theelectromagnetic signal resource for induction, when the devise accordingto the present invention is in use. The electromagnetic handwritingoperating-pen transmits frequency-fixed signal or data electromagneticsignal continuously. When the pen-point is pressed and touched, theelectromagnetic field passes through the antenna array, and theelectromagnetic signal is induced by the corresponding underlayerhorizontal antenna and top-layer vertical antenna in the center andneighborhood of the electromagnetic signal resource. The electromagneticsignal is transferred to CPU via identification circuit interface. TheCPU calculates and compares the location and voltage value of theinduction antenna, frequency signal changes, and determines the locationof the electromagnetic signal resource and various operation statuses,then transfers the result to PC so as to control the PC to performvarious operation commands. Said operation is, for example, identifyingfor character or pattern, drawing and calling for shortcut key, and soon.

The electromagnetic pen transmits electromagnetic signal continuously.When pen-point touches the induction generation device, saidelectromagnetic signal passes through the induction antenna at thecorresponding location, then the antenna at this location induces asignal. The location signal induced by the induction generation deviceis transferred to the input terminal of the control identificationcircuit through the wire lead on X, Y direction. After array strobe,control process, bandpass filter, detection-rectification and A/Dconversion, the resultant location signal is transferred to the CPU ofthe processing circuit to calculate, so as to determine the locationcoordinates of the electromagnetic signal on the induction antenna andvarious operation statuses. Above data or information is sent to acomputer, whereby to control the computer to identify, display, recordand so on.

Furthermore, in order to obtain the pressure of pen-point as writing andto improve the induction accuracy of the location signal, a Z-axisdirected pressure sensor is provided in the tail of the pen-point, andthe output of the sensor is connect to the control terminal of theelectromagnetic wave generation device. So the transmittedelectromagnetic wave signal can be changed by the pressure-touching,thereby the pressure (input signal) of the pen-point can be identifiedmore reliably.

The present invention can be widely applied to various touch controlequipment. Meanwhile, the idea of the present invention is not limitedin the incorporation of the electromagnetic induction layer and flatdisplay screen, but the electromagnetic induction layer can be providedin the rear of other non-CRT display screen, such as nonplanar plasmadisplay screen and nonplanar liquid-crystal display screen with variousprofile, so as to realize the touch screen with low cost.

1. A touch control display screen with built-in membrane antenna arraylattice electromagnetic induction layer, including at least a displayscreen and a shell; wherein an induction layer is provided in the rearof the display screen, an output of the induction layer is connected toan induction control circuit, a display screen control circuit is alsoprovided in the shell, wherein: said induction layer is an antenna arrayformed by silver-plasm or mixture of silver-plasm and carbon-plasm whichis printed on an insulation membrane and arranged along X, Y axes,therein the area enclosed by each lattice unit of the antenna arrayconstitutes one induction cell; said insulation membrane is made by filmmaterial; there are two or more said induction layers, and the inductioncells on respective induction layers are set to interlace each other; ashield layer is provided after the induction layer; and a bufferinglayer is further provided between the induction layer and the shieldlayer in order to keep a space between the induction layer and theshield layer.
 2. The touch control display screen with built-in membraneantenna array lattice electromagnetic induction layer according to claim1, wherein said induction layer is printed on two opposite surfaces ofthe insulation membrane, or printed on one surface of the insulationmembrane, and there are two layers of the insulation membrane in whichone is overlaid on the other.
 3. The touch control display screen withbuilt-in membrane antenna array lattice electromagnetic induction layeraccording to claim 1, the induction control circuit is mounted on aprinted substrate which is separated from the induction layer, theoutput of the induction layer is connected to a corresponding inputterminal on the printed substrate by means of pressure-connection,plug-in connection or welding-connection.
 4. The touch control displayscreen with built-in membrane antenna array lattice electromagneticinduction layer according to claim 3, wherein said output of theinduction layer is positioned between a hard sheet and the printedsubstrate; the buffering layer is provided between the hard sheet andthe output of the induction layer; the hard sheet, the buffering layerand the output of the antenna array are overlaid on the printedsubstrate by means of the screwing-conjunction.
 5. The touch controldisplay screen with built-in membrane antenna array latticeelectromagnetic induction layer according to claim 4, wherein saidprinted substrate is the printed substrate of the display screen controlcircuit in the body of the display screen.
 6. The touch control displayscreen with built-in membrane antenna array lattice electromagneticinduction layer according to claim 4, wherein said printed substrate isthe printed substrate of the display screen control circuit outside thebody of the display screen, or a self contained unit.
 7. The touchcontrol display screen with built-in membrane antenna array latticeelectromagnetic induction layer according to claim 1, wherein saidinduction control circuit is positioned outside the body of the displayscreen, and connected to the body of the display screen throughelectrical connection means; the output of the induction layer isconnected with an output interface of the induction layer by means ofpressure connection, plug-in connection, or welding-connection; aninterface which matches the electrical connection means of the inductionlayer is provided on the control circuit.
 8. The touch screen withbuilt-in wire lattice electromagnetic induction layer according to claim7, wherein said output interface of the induction layer and theinterface of the control circuit are one of the followings: pin-typeconnection means, flexible printed circuitry means, PIN-PIN connectionmeans, welding spot (VGA) thermal-melted connection means, ultrasonicwelding device, solder-plate welding device, puncture-type connectionmeans.
 9. The touch control display screen with built-in membraneantenna array lattice electromagnetic induction layer according to claim1, a protecting layer is provided in front of said display screen. 10.The touch control display screen with built-in membrane antenna arraylattice electromagnetic induction layer according to claim 1,characterized by: the said display screen is a plasma display screen ora liquid-crystal display screen.